Multiple-tread pneumatic tire



A. JAKOVLEFF. MULTIPLE TREAD PNEUMATIC TIRE.

APPLICATION FILED IULYQ. 1918- RENEWED AUG- 18, I919.

Patented Mar. 30, 1920.

- Ina/em! fllezis Jz/wwleff aimmul fltforneys ALEXIS JIAKQVLEFF, orsan rRAnoIsco, cenisoanm,ass enonroaax rmntconro- RATION, or SAN FRANCISCO, onnrronnm, a oonroaa'r on or CALIEORNIA,

' MULTIPLE-TREAD rnEUMATIcTIRE.

Specification of Letters Patent.

Application filed July-9,1918, Serial n. 244,062. Renewed August'18, 1919; 'Seria1No.318,310.

To all/whom 2'25 may concern:

Be it known that I, ALEXIS V-J AKOVLEFF, a subject of the Emperoivof Russia, residing at the city and county of SanFrancisco and State of California, have invented new and useful Improvements in Multiple-Tread Pneumatic Tires, of which the following is a specification. V

This invention relates to apneumatic tire, and'particularlypertainsto a tire casing of sectional formation provided with multiple tread members.

It is the principaLobject of:this invention to provide a pneumatic tire, the casing of Which may be readily separated and removed without .difliculty, .and which is designedto receive a circumscribing'tire tread of :sectional construction by which the cats ing sections .are secured tog-ether,- thus in- .suring'thatra conveniently manipulated tire :may :be provided as well as :increasing the durability ;of the :tire structure and tits resilient-equalities.

.The ;present invention. contemplates the use :of a tire casing adapted to -be mounted upon a common tire rim, and which is formed ;in separate 'annularjhalves united alongitheir .clrcumferential "portions by untachably mounted upon the and when united, form -matic tube :14. In the locking metallic :tread auxiliary tire'treads. v

The :invention .is :illustrated -by Way of rings which carry example by the accompanying drawings in Figure '1 1s a view in transverse section taken radially :of a tlre vformed according to :the' principle of 'the present invention.

Figs32 and v3 illustrate fragmentary portions of the complementary tread rings.

.Fig. :4 is .afragmentary view vin elevation illustratingportions of the tread rings opings', 10 indicates a wheel 'felly upon which .ismounted a tire rim 11. This rim may be of any desired construction, but ,it {is prefer- :ably designed to permit a tire to be demounted therefrom WltllOUt difliculty. De-

rim 11 are a pair-of complementary casing sections 12 and 13. These sections are separated along the 'ilongitudinal circumference of the tire,

a continuous annular chamber for the recention of a pneupresent instance the outer and inner circumferential faces of of these wedge-shaped, gently extending ;ton ues r20 are :formed along the contiguous .e'd gesi'of' the treadlrings V15 and316, .and .overlapito conform toithe in :the casing, it being understood that the outer circumference of the casing sections :are flat when' colnsidered laterally. .intermesh with eachother, butareprovided with looking recesses .21,by whic'hthey may against accidental sections may be bound each casing sectionare provided Withannular laterally extending Lflanges. The inner flanges are engaged by the rim l1, While the outer ifianges are engaged by the complementary tread rings 15 and 16.

The tread ringsare specially disclosed in Figs.'2, 3 a11d4, where it willbe seen that each ring comprises a flat annulus along the opposite marginal edges on which are outwardlyle'xtending flanges 17 and 1,8. ,Ex-v tending diametrically opposite from the flanges :17 are inturned engaging flanges :19, by--whichthe outer'flanges o'f thecas'ingr-are secured. .It is-to benoted that 'theitermin-ating edge casing sections .are .tsubstantially and for this :reason diverclined :inner faces :of

These tonguesnot :only crosszan'd be caused to be held removal. In this manner a limited :rlative movement is afl'orded between the two :-.r.im members, and *thus2provides local movement of the resilient treads 22 carried .by "the rings. The tongues are also formed :with

vout-turned ends whichprovide lockingkridges adapted to become'embodied within the inner surfaces of the casing :sections and F to therefore prevent "relative ;:move"ment :of the sections in relation to the casing 231d ,separation of the rims; The inner faces of ithe tongues are, of course, made smoothattheir ends, preferably rounded to prevent Wear of the inner tube 14 and the possible puncture thereof. L

In applying the present device to a vehicle wheel it isonly necessary-to provide a wheel of standard construction and dimension,

uponwhich the usual rim .is-mounte'd; Over this rim are placed the ;complementary casing sections between which is 'positionedthe inner tube 14, After the tube Zhas -been properly placed with its-inflating estem through the opening in the wheelufelly, {the outer circumferential edges of the leasing together. This ;is done by applying "one ofthe grings to each of-the sections with their inturnedi-fianges engagement with the outwardly extending" Patented narteaaezor Y of parts may be made by flanges of the casings. When in this position the outer circumferential portions of each casing section will be firmly held, due to the cooperation of the inturned ring flanges with an annular shoulder 2 f formed at the point of immanation of'the' tongues from the ring. After the outer edges of the casing sections have been properly bound by the tread rims, these rims may be brought with their tongues intermeshing, as particularlyshown in Fig. 4%. \Vhen in this position the treads 2 will be in lateral alinement, and the groove portions 21 of the tongues will be interlocked to produce a support for the treads 22. It will be readily recognized that the treads may be easily interchanged or re placed when desired, and that they will be afforded suflicient relative movement to insure desirable riding qualitiesfor the tire; When it is desired to replace or repair the inner tube the two outer rims may be moved circumferentially in relation to each other until the tongues become disengaged at their recesses 21. After this has been. done the tongues and rings may be separated and ready access afforded to the interior of the casing. It will, of course, be possible to remove either of the casing sections after the tread rims have become disengaged.

It will thus be seen that the tire structure here disclosed provides simple means for incasing a tire tube, and proper means for surrounding the tube with a metallic armor to prevent its puncture and segmental re placement of treads, which are adapted to yield and to afford proper traction for the ire.

While I have shown the prefered form of my invention as now known to me, it will be understood that various changes in the combination, construction and arrangement those skilled in the art without departing from the spirit of the invention as claimed. 7

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. A pneumatic tire comprising separate annular casing walls, means for detachably securing the inner edges of said walls together, and circumscribing tread bearing means provided on the outer edges of said walls whereby they may be temporarily interlocked and unlocked by relative circumferential movement of said means.

'2. A pneumatic tire comprising an inflation tube, annular casing parts adapted to unite to inclose said tube, a band upon which said parts are mounted,-and by which they are held together along their inner edges, and a pair of annular members connected so as to have relative movement and mounted upon the outer edges ofsaid parts whereby said outer edges may be secured to each ing sections;

other to complete the inclosure of said inflation tube. v I V s 3. A pneumatic tire comprising acasing formed of two complementaryhalves, a detachable tread member fitted upon each of said halves, and means for simultaneously locking said tread members and easing halves together to form an annular pneumatic tube compartment. q

4. A pneumatic tire comprising a casing formed of two complementary halves, a de tacha'ble tread member fitted upon each of said halves, means for simultaneously locking said tread members and casing-halves together to form an annular pneumatic tube compartment, and means whereby said tread members may have yielda'ble movement in relation to each other. i

5. In a pneumatic tire, a sectional casing, and a pair of members for securing the peripheral portions of the casing sections to gether, said members having inner portions which cross each other.

6. In a pneumatic tire, a sectional casing, a pair of members for securing the peripheral portions of the casing sections together, and means for interlocking said members so as to allow of separation thereof by relative circumferential movement.

7. In a pneumatic tire, a sectional casing, and a pair of sectional means one for each casing section for securing the casing sections together, said sections of the sectional means having portions which respectively engage the inner faces of the opposite casing section. v

8. In a pnemnatic tire, a sectional casing,

and sectional means having relative movement therebetween for securing the casing sections together. V

9. In a pneumatic tire, a sectional casing, a pair of members for securing the. casing sections together, and means to connect said members so asto allow the latter to have relative movement therebetween.

10. In a pneumatic tire, a sectional casing, a pair of members for securing the casing sections together, said members having tread holding means on their outer portions and having crossed and movably connected inner portions, said crossed inner portions engaging the inner faces of the respective casing sections, and means borne by said members to engage the outer edge portions of the eas- 11. In a pneumatic tire, a peripherally divided casing, a pair of interengaging means extending around the periphery of the'casing tread for simultaneously securingeach of the edges of said casing together, and means to allow of separation of said first named means by relative circumferential movement thereof.

12. In a pneumatic tire, a sectional casing, a pair of separable tread bearing members,

extending circumferentially of the casing, and interengaging means borne by said members to connect same together.

13. In a pneumatic tire, a sectional casing, a pair of tread bearing members extending circumferentially of the casing and arranged thereover, and means borne by the members and bearing against the inner faces ofv the respective opposite sections to secure the casing sections together.

14. In a pneumatictire, a sectional casing, and sectional means to secure the casing sections together, said means having spaced tongues to engage interiorly of the casing sections.

15. In a pneumatic tire, a sectional casing, and sectional means to secure the casing se tions together, said means having spaced tongues to engage interiorly of the casing sections, the tongues having mutual locking recesses 1n one of then side edges.

16. In a pneumatic tire,

7 a sectional casing and sectlonal means to secure the casing secmeans to secure the casing sections together,

and means to connect said members at the tread portions thereof so as to allow of 'relative movement therebetween. I g In testimony whereof I have hereunto set my hand in the presenceof tWo subscribing Witnesses. V V I V ALEXIS JAKOVLEFF. Witnesses:

ALVA- MILLER, CONSTANGE M. GAMMETER. 

